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9400016-J0 Rev D
7.2.2 Reference Ground
The reference ground should be connected between the building master ground bus (MGB) or floor ground bus
(FGB) and the power system power system internal battery return bus (BRB) in ONLY ONE location. If the MGB or
FGB is connected to the power system BRB in more than one location then load current will circulate through the
reference ground bond, creating and unsafe condition known as “ground loop”.
Exact connection should be determined by the site engineer, but in general the recommended connection locations
are:
Order of
Precedence
System Characteristic
Connection Point
1
2V battery stacks
Battery termination bar
2
Connected to larger power
system
Power system internal battery return bus (BRB)
3
CXPS-E3 battery landing bus
bar
If this option is included (extends out through back cover)
4
CXPS-E3 return bar location
Return busbar
Battery landing
busbar
If not all positions are
being used for loads
